8.19. Stretch Contrast HSV

The Stretch Contrast HSV command does the same thing as the Stretch Contrast command, except that it works in HSV color space, rather than RGB color space, and it preserves the Hue. Thus, it independently stretches the ranges of the Hue, Saturation and Value components of the colors. Occasionally the results are good, often they are a bit odd. “Stretch Contrast HSV” operates on layers from RGB and Indexed images. If the image is Grayscale, the menu entry is insensitive and grayed out.

8.19.1. Activate the Command

• You can access this command from the image menubar through Colors → Auto → Stretch Contrast HSV.

8.19.2. “Stretch Contrast HSV” example

Figure 16.185. Original image

The active layer and its Red, Green and Blue histograms before “Stretch Contrast HSV”.

Figure 16.186. Image after the command

The active layer and its Red, Green and Blue histograms after “Stretch Contrast HSV”. Contrast, luminosity and hues are enhanced.